dedicatory vs memorial service

dedicatory

noun
  • A dedication. 

adj
  • Of or pertaining to dedication. 

memorial service

noun
  • A ceremony to honor a deceased person; a funeral. 

  • An informal service honoring a deceased person, especially one that does not adhere to the traditional customs of a funeral. 

How often have the words dedicatory and memorial service occurred in a corpus of books? (source: Google Ngram Viewer )